Breast cancer can eat sea fish, but it is recommended that it be steamed and eaten in moderation. In fact, breast cancer patients can eat sea fish. Although there are some sayings in Chinese medicine that cancer patients should not eat fish, especially sea fish and sea shrimp, because they belong to hairy substances, but after a lot of clinical research, it has not been found that fish and shrimp can promote the occurrence and development of tumors. In addition, sea fish is a kind of high-quality protein, which can provide high-quality protein for breast cancer or advanced breast cancer patients, and even malignant patients, that is, those who are malnourished and very thin, or those who need nutrition during chemotherapy, and can serve as a nutritional supplement. Therefore, breast cancer patients and other cancer patients can eat sea fish under normal dietary conditions. Sea fish should be steamed as much as possible, avoiding frying, as fried and high-fat foods are not good for breast cancer. Steaming will make absorption easier and retention of nutrients better. Therefore, sea fish and sea prawns are actually high-quality proteins, and patients can consider eating them in moderation after consulting their medical professionals.